The Tamron SP 24-135mm, model 190D is not D compatible. The only Tamron SP zoom lenses that are compatible with ADI are the Sp 17-35mm, Sp 28-75mm and Sp 200-500mm plus the 90 and 180mm primes.
A D compatible lens is not required for TTL-preflash. Only when you set the camera on ADI Flash do you need a D lens.
I have the Minolta 5600HS(D) and the only essential difference between it and the 3600HS(D) is the guide number. It is very easy to see whether you have a D flash or not, there is a large D on the top of the strobe part. I have no problems with flash exposure, other than those that are my fault.
Hendrik, if you have a 3600HS(D) you will know it. Your camera settings are correct if you are using the flash on camera and not using a D lens. Make sure you are in A mode, I find this best. If you do not get good results and you are using good technique, the flash and/or the camera may have to be re-calibrated. I believe Konica Minolta will do this for free.